Incorrect Access Control in TOTOLINK T6 Firmware

Executive Summary

This vulnerability is an incorrect access control issue in the setWiFiSignalCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to manipulate wireless signal settings or cause a Denial of Service by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

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Detection Guidance

Detecting this vulnerability requires checking for unauthorized POST requests to /cgi-bin/cstecgi.cgi targeting the setWiFiSignalCfg function. Monitor network traffic for suspicious POST requests to this endpoint, especially those attempting to modify WiFi signal settings without authentication.

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Impact Analysis

If exploited, this vulnerability could allow attackers to reduce your wireless network's power or disrupt its operation entirely, causing a Denial of Service. This could lead to loss of internet connectivity or degraded network performance for all connected devices.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it involves unauthorized access to wireless settings causing DoS or power reduction. Compliance impact would depend on how the device is used in a system handling sensitive data.

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Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version if a patch is available. Disable remote access to the web interface if not required. Block external access to /cgi-bin/cstecgi.cgi via firewall rules. Monitor network traffic for unusual POST requests to this endpoint.

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